Question

How do you differentiate `f(x)=(x)*(x)-2x^2` using the product rule?

Answer 1

Write it as `x (x-2*x)` and apply the product rule to this product.

Explanation:

You are given `x*x-2x^2` and this is a sum not a product, so you cannot apply directly the product rule; in order to apply the product rule you need to transform it first into a product.